This thread is so powerful, it is actually making me consider purchasing a $25 iPhone app 
https://twitter.com/michael_nielsen/status/957763229454774272 …
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It’s funny how we value apps. I also second-guessed the price tag. The reality is, if you use this consistently to learn and retain knowledge, it’s worth thousands of dollars.
The median value is $0. But for me - an outlier - tens of thousands minimum. I'd rather have Anki on my iPhone than a car.
